<template>
  <el-container class="home-container">
    <!-- 头部区域 -->
    <el-header>
      <div>
        <img src="../assets/main_logo.png" alt="" />
        <span>电子商品商城管理系统</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button>
    </el-header>
    <!-- 页面主体区域 -->
    <el-container>
      <!-- 侧边栏（左） -->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">《《《</div>
        <!-- 侧边栏菜单 -->
        <el-menu
          background-color="#227ebb"
          text-color="#fff"
          :unique-opened="true"
          :collapse="isCollapse"
          :collapse-transition="false"
          :router="true"
          :default-active="activePath"
        >
          <!--  
                1.unique-opened   每次只展开一个子菜单 
                2.collapse    侧边栏的收起
                3.collapse-transition	是否开启折叠动画
                4.router    是否使用 vue-router 的模式，
                启用该模式会在激活导航时以 index 作为 path 进行路由跳转
          -->
          <!-- 一级菜单 -->
          <el-submenu
            :index="item.id + ''"
            v-for="item in menulist"
            :key="item.id"
          >
            <!-- 一级菜单的模板区 -->
            <template slot="title">
              <!-- 图标 -->
              <i :class="iconobj[item.id]"></i>
              <!-- 文本 -->
              <span>{{ item.authName }}</span>
            </template>

            <!-- 二级菜单 -->
            <el-menu-item
              :index="'/' + subItem.path"
              v-for="subItem in item.children"
              :key="subItem.id"
              @click="saveNavState('/' + subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                <i class="el-icon-menu"></i>
                <!-- 文本 -->
                <span>{{ subItem.authName }}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!-- 主体内容（右） -->
      <el-main>
        <!-- 路由占位符 -->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data() {
    return {
      // 左侧菜单数据
      menulist: [],
      // 菜单栏图标
      iconobj: {
        125: 'el-icon-user-solid',
        103: 'el-icon-location',
        101: 'el-icon-s-goods',
        102: 'el-icon-s-claim',
        145: 'el-icon-s-marketing',
      },
      //关于菜单栏的收起，默认为否
      isCollapse: false,
      // 被激活的连接地址
      activePath: '',
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('./login')
    },
    // 获取所有的菜单
    async getMenuList() {
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menulist = res.data
      console.log(res)
    },
    // 收起或展开侧边栏的点击事件
    toggleCollapse() {
      this.isCollapse = !this.isCollapse
    },
    // 保存连接的激活状态（用于显示二级菜单的选中高亮状态）
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      // 用于返回后再点击还能高亮显示
      this.activePath = activePath
    },
  },
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
  .el-header {
    background-color: #359add;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #eaedf1;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #227ebb;
    .el-menu {
      border-right: none;
    }
    .toggle-button {
      background-color: #074168;
      text-align: center;
      color: #fff;
      font-size: 20px;
      cursor: pointer;
    }
  }
  .el-main {
    background-color: #eaedf1;
  }
}
</style>